Excess Flow Valve vs Praxair, Swagelok and Malema

Article Published: December 21, 2022 2:08 PM
Last Updated: August 22, 2025 10:44 AM
Written by: Jack Carr

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Our range of automatic controlled bleed and manual reset excess flow valves are the perfect solution for preventing uncontrolled flows of gases and liquids. They can be considered for the following primary uses:

• As a Safety Product for use with aggressive and toxic media systems to prevent potentially deadly leaks or pipework ruptures. The excess flow valves can be factory pre-set according to individual process parameters to detect and shut-off lines with uncontrolled gas flows to atmosphere. 
   
• To provide Commercial Savings as they can be used to stop precious and expensive media (such as Helium) from escaping through relief valves to atmosphere or protected waste areas. Units can be specified to provide a positive shut-off to prevent any loss of media.

Our EFVs can also be referred to as excess flow control valves or velocity fuses. 

See below for a comparison of how our excess flow valves are designed to function: 

For more information on our EFVs, why not read our intuitive guide for Selecting an Excess Flow Valve, which can be downloaded by clicking on the image on the left.

We have prepared this convenient short guide to help assist you with what information we require in order to provide a recommendation on a suitable unit. Key pieces of information required for sizing an EFV are:

– The exact gas or liquid being transported

– Line Pressure

– Normal and maximum flow rate conditions

Whether you are looking for a standard catalogue part number or a completely bespoke design, we can offer a solution that has got you covered.

For more information on how we can help you, get in touch today. 

Meet the Author

Jack Carr

Technical Sales & Marketing Manager, Boiswood

Jack combines deep technical expertise with hands-on experience in pressure and flow control systems. With a strong focus on real-world applications, he works closely with customers to understand their challenges and deliver fit-for-purpose solutions. His practical approach and in-depth product knowledge ensure every recommendation is accurate, efficient, and built around performance.

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